Heating device



FIG. 1 is a top plan view of a heating device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left end elevational view thereof, the right end being themirror image;

FIG. 4 is a perspective view taken from the bottom and side thereof;and,

FIG. 5 is a perspective view taken from the bottom and side thereof,tilted backward from the position shown in FIG. 4.

The ornamental design for a heating device, as shown and described.